JPH07191409A - Vacuum contact printing device - Google Patents

Abstract

PURPOSE:To improve the contact between an original film and a photosensitive material by a simple structure. CONSTITUTION:A communicating hole 16 through which a gap S between a translucent plate 11 and the original film F communicates with the air is formed on an original plate holder 10 in a planar photocomposer 1. When the original film F is brought into vacuum contact with the photosensitive material P, the air flows in the gap S through the communicating hole 16 because of the difference of air pressure, and the original film F is pressed to the photosensitive material P side. Thus, the contact between the original film F and the photosensitive material P is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum contact printing apparatus for exposing a light-sensitive material to an original film or an original film in vacuum.

[0002]

2. Description of the Related Art An engraving machine, which is a type of vacuum contact printing apparatus, has an original plate holder for holding an original film on the lower surface of a translucent plate, and this original plate holder is used as a photosensitive material held on a photosensitive material holding table. Printing is performed with relative positioning. In this plate-making machine, conventionally, the original film is directly attached to the original plate holder with a tape or the like and held. Further, in recent years, the original film (hereinafter referred to as the original film that is obtained by sticking the original film on a transparent auxiliary sheet) is sucked and held by the vacuum suction groove provided in the original holder, so that the original film is substantially It is held in the original plate holder. Then, the original plate holder and the photosensitive material holding base are pressed and evacuated, and the photosensitive material and the original film are brought into vacuum contact with each other.

Further, even in a vacuum contact printing apparatus of a type in which the original film is not held on the original plate holder, such as a printing frame or a belt-conveying type multi-sided printing machine disclosed in Japanese Utility Model Laid-Open No. 62-19649, the mounting table can be used. The photosensitive material placed on the top and the original film are vacuum-contacted for printing.
In such a vacuum contact printing apparatus, if the vacuum contact between the photosensitive material and the original film is not completely performed, a contact failure called burn-in occurs. In particular, in an engraving machine that holds the original plate film on the original plate holder by vacuum suction, the original film film is brought into close contact with the transparent plate due to vacuum suction, so that the distortion, the curvature, and the unevenness of the transparent plate easily cause burning. Further, when an original film having a large number of original films stuck thereto is used, or when a photosensitive material holding table having a hard surface such as an aluminum board is used, a step difference in the stuck portion or the like tends to cause poor adhesion.

Therefore, for example, Japanese Patent Laid-Open No. 63-115155.
A technique as disclosed in Japanese Patent Publication has been proposed. In this vacuum contact printing apparatus, first, the auxiliary sheets to which the original film is attached are doubled, and a hermetic air layer is interposed between the auxiliary sheets. When vacuum contact is performed in this state, the air layer in a sealed state expands as the pressure is reduced by exhausting, whereby the auxiliary sheet swells toward the photosensitive material and presses the original film against the photosensitive material. As a result, a pressing force that pushes the original film toward the photosensitive material is applied, and since the influence of distortion and unevenness of the light transmitting plate is small, the adhesion effect is higher than in the case of only general vacuum adhesion. In addition to the double structure of the auxiliary sheet, it is also conceivable to attach the original film in a hermetically sealed state to a normal auxiliary sheet.

[0005]

The above-mentioned conventional techniques are effective for poor adhesion such as burn-in. However, the double-structured auxiliary sheet is more complicated and costly than a normal auxiliary sheet, and when the original film is hermetically stuck to the auxiliary sheet, it takes a lot of time to stick and peel it off. There is room for improvement in that the pressing force due to air pressure is relatively small because the air layer is very small.
In particular, when the original film is attached to the auxiliary sheet in a hermetically sealed manner, a small original film has a small air layer to be sealed, and thus a predetermined effect is difficult to appear. Further, since the conventional technology is premised on the use of an auxiliary sheet, a baking machine that does not use an auxiliary sheet such as the above-described baking frame or a belt-conveying type multi-sided printing machine, or without using an auxiliary sheet. It cannot be used for a plate-making machine that attaches the original film directly to the original plate holder.

An object of the present invention is to improve the adhesion between the original film or the original film and the photosensitive material with a simple structure that does not require complicated labor.

[0007]

A vacuum contact printing apparatus according to a first aspect of the present invention is an apparatus for printing an image formed on a master plate film on a photosensitive material by vacuum-contacting the master film on the photosensitive material. The photosensitive material holding table for holding the material, the original plate holder, the vacuum contact means, and the exposure means are provided. The original plate holder includes a translucent holding member for holding the original film and a communication hole for communicating the gap between the original film and the holding member with the atmosphere or a high pressure source, and holds the photosensitive material while holding the original film. The original film is positioned with respect to the photosensitive material held on the table. The vacuum contact means evacuates the space between the photosensitive material holder and the original plate holder to bring the photosensitive material and the original film into vacuum contact. The exposing means exposes the vacuum-closed photosensitive material and the original film through a holding member.

A vacuum contact printing apparatus according to a second aspect of the present invention is an apparatus for printing an image formed on the original plate film on the photosensitive material by vacuum-contacting the original film on the photosensitive material.
It is provided with a photosensitive material holder for holding a photosensitive material, an original plate holder, a vacuum contact means, and an exposure means. The original plate holder is a translucent holding member that holds at least a part of the original plate film, a flexible transparent member whose periphery is fixed to the original plate film holding side of the holding member, and a flexible transparent member that holds the original film. The original film is positioned with respect to the photosensitive material held on the photosensitive material holding table, with a part of the original film being held, and a communication hole that communicates a gap between the original film and the atmosphere or a high pressure source. The vacuum contact means evacuates the space between the photosensitive material holder and the original plate holder to bring the photosensitive material and the original film into vacuum contact. The exposing means exposes the vacuum-closed photosensitive material and the original film through a holding member.

A vacuum contact printing apparatus according to a third aspect of the present invention is an apparatus for printing an image formed on an original film on a photosensitive material by vacuum contacting the original film on the photosensitive material.
A mounting table on which the photosensitive material and the original film are stacked and mounted,
It is provided with a transparent frame, a vacuum contact means, and an exposure means.
The translucent frame includes a translucent plate, a flexible translucent member whose periphery is fixed to the mounting table side of the translucent plate, and a gap between the flexible translucent member and the translucent plate as an atmosphere or a high voltage source. It is provided with a communication hole communicating with it and is provided so as to be openable and closable with respect to the mounting table. The vacuum contact means evacuates the space between the mounting table and the light-transmitting frame to bring the photosensitive material and the original film into vacuum contact. The exposure means exposes the light-sensitive material and the original film, which are in vacuum contact with each other, through a light-transmitting plate.

[0010]

In the vacuum contact printing apparatus according to the first aspect of the invention, the photosensitive material is held on the photosensitive material holder and the original film is held on the holding member of the original plate holder, and in this state, the original film is held against the photosensitive material by the original plate holder. Is positioned. Then, the space between the photosensitive material holder and the original plate holder is evacuated by the vacuum contact means, and the photosensitive material and the original film are brought into vacuum contact with each other. At this time, air flows into the gap between the original film and the holding member through the communication hole due to the difference in atmospheric pressure. As a result, since the original film is extruded toward the photosensitive material side, the adhesion between the original film and the photosensitive material is higher than that of normal vacuum adhesion with a simple structure in which a communication hole is provided without complicated labor. . When the original film and the photosensitive material are vacuum-contacted in this way, the exposing means exposes the original film and the photosensitive material through the holding member, and the image of the original film is printed on the photosensitive material.

In the vacuum contact printing apparatus according to the second invention,
The photosensitive material is held on the photosensitive material holder, a part of the original film is held with the flexible transparent member sandwiched by the holding member of the original plate holder, and in this state, the original film is positioned with respect to the photosensitive material by the original plate holder. To be done. Then, the space between the photosensitive material holder and the original plate holder is evacuated by the vacuum contact means, and the photosensitive material and the original film are brought into vacuum contact with each other.
At this time, air flows into the gap between the flexible light-transmitting member and the holding member through the communication hole due to the difference in atmospheric pressure. As a result, the flexible transparent member is extruded to the photosensitive material side, and the original film is further extruded to the photosensitive material side, so that the original film is simply formed with a communication hole without complicated labor. Adhesion with the photosensitive material is higher than with ordinary vacuum adhesion. When the original film and the photosensitive material are vacuum-contacted in this manner, the exposing means exposes the original film and the photosensitive material through the holding member and the flexible transparent member, and the image of the original film is printed on the photosensitive material. .

In the vacuum contact printing apparatus according to the third invention,
When the original film and the photosensitive material are placed on the mounting table, and the translucent frame is closed and placed on the mounting table, the space between the mounting table and the transmissive frame is evacuated by the vacuum contact means, and the photosensitive frame is exposed. The material and the original film are brought into vacuum contact with each other. At this time, air flows into the gap between the flexible light-transmitting member and the light-transmitting plate through the communication hole due to the difference in atmospheric pressure. As a result, the flexible translucent member is pushed out to the side of the photosensitive material holding base, and the original film is pushed out to the side of the photosensitive material, so that no complicated labor is required,
With a simple structure in which only a communication hole is provided, the adhesion between the original film and the photosensitive material is higher than in normal vacuum adhesion. When the original film and the photosensitive material are thus brought into vacuum contact with each other, the original film and the photosensitive material are exposed through the light transmitting plate by the exposure means, and the image of the original film is printed on the photosensitive material.

[0013]

【Example】

[Embodiment 1] FIG. 1 is a perspective view of a flat plate-type engraving machine as Embodiment 1 of a vacuum contact printing apparatus according to the present invention. The flat plate-type engraving machine 1 has a base 3 having a photosensitive material holding base 2 for holding the photosensitive material P on its upper surface, and a horizontal direction (arrow X direction) on the base 3.
The left and right movable gantry 4 is movably installed on the left and right, and the front and rear movable gantry 5 is supported on the left and right movable gantry 4 so as to be movable in the front-rear direction (direction of arrow Y). This front and rear moving stand 5
Is provided with a master plate holder holding portion 6 for storing a master plate holder 10 (see FIG. 2), a light source 7, and a supply part 8 and a discharge part 9 for supplying and discharging the master film film. Supply unit 8
A plurality of original film films can be stacked by a positioning pin (not shown), and the supply unit 8 and the discharge unit 9 are selectively moved below the original plate holder holding unit 6 by a driving unit (not shown). The original plate holder 10 moves up and down with respect to the photosensitive material holding base 2 in the original plate holder holding portion 6 by a driving means (not shown).

Next, the original plate holder 10 will be described. 2 and 3 are views showing a cross section and a plane of the original plate holder 10, in which the thickness of each portion and the like are exaggeratedly drawn. The original plate holder 10 includes a transparent plate 11 and the transparent plate 1.
A frame 12 that holds the periphery of the frame 1 and a packing member 13 that is provided around the lower surface of the frame 12. Frame 1
On the lower surface of 2, the original film F is formed along the periphery of the transparent plate 11.
A vacuum suction groove 14 for sucking and holding the vacuum suction groove 14 is provided, and the vacuum suction groove 14 is connected to a vacuum pump P1 via an electromagnetic valve V1. Therefore, when the vacuum pump P1 is operated to bring the electromagnetic valve V1 into the communicating state, the original film F can be adsorbed and held on the lower surface of the original holder 10 by the negative pressure. As the original film F, the auxiliary sheet 15 to which the original film 19 is attached is used.

In the frame 12, a plurality of communication holes 16 for communicating the space between the auxiliary sheet 15 and the transparent plate 11 (gap S) with the atmosphere are formed inside the vacuum suction groove 14. Also,
The frame body 12 is provided with an exhaust passage 17 for connecting the space (vacuum chamber R) between the original plate holder 10 and the photosensitive material holding base 2 to the vacuum pump P2 for vacuum exhaust. A mask holding groove 18 is provided outside the vacuum suction groove 14 along the vacuum suction groove 14. The mask suction groove 18 is for sucking and holding a mask film (not shown),
It is connected to a vacuum pump P1 via a solenoid valve V2.

The vacuum suction groove 14 is engraved so as to surround the entire circumference of the transparent plate 11 so that air does not flow between the vacuum chamber R and the gap S. Although it is preferable that the entire circumference is not completely closed, it can be practically used as long as the air flow is small.
Next, the operation of the flat type plate making machine 1 will be described.

When vacuum contact printing is performed by using the flat type plate making machine 1 and the original plate holder 10, first, a predetermined original film F is loaded on the supply section 8 and the photosensitive material P is placed on the photosensitive material holding base 2. Set it aside. Next, the supply unit 8 is moved to the lower side of the original plate holder holding unit 6, and the original plate holder 10 is moved to the supply unit 8
The original film F loaded on top is lowered. Then, the original film F is attached to the original holder 10 by vacuum suction.
Is adsorbed and held. When the holding of the original film F is completed, the original plate holder 10 is raised to retract the supply unit 8 from the lower side of the original plate holder holding unit 6. Next, with the original film F held on the lower surface of the original plate holder 10, the photosensitive material holder 2
The original film F is positioned with respect to the photosensitive material P held by, and the original plate holder 10 is moved down and pressed.

Subsequently, the vacuum chamber R is evacuated by the vacuum pump P2 to bring the original film F and the photosensitive material P into vacuum contact with each other. When the atmospheric pressure in the vacuum chamber R decreases due to exhaust, air flows into the gap S from the communication hole 16 and the original film F
The auxiliary sheet 15 is pushed to the side of the photosensitive material P as shown in FIG. Therefore, the document film 19 is brought into close contact with the photosensitive material P by applying a pressing force by the atmosphere in addition to the negative pressure by the exhaust, and more effective vacuum contact can be performed. In particular,
In an engraving machine of the type in which the original film F is adsorbed and held on the lower surface of the original plate holder 10, the original film F is the transparent plate 1.
It is effective because the distortion and the unevenness of the translucent plate do not adversely affect the adhesion by closely contacting with No. 1.

When the vacuum contact is completed, the light source 7 exposes it. After the exposure is completed, the vacuum chamber R is opened to the atmosphere to release the vacuum contact. When the positioning and the vacuum contact printing process are performed a predetermined number of times, the discharging unit 9 is moved to the lower side of the original plate holder holding unit 6. In this state, when the suction and holding of the original film F by the original plate holder 10 is released, the original film F is released.
Is dropped and discharged to the discharge unit 9, and the work is completed. At the time of this discharging operation, air is blown from the vacuum suction groove 14 to forcibly discharge the original film F. However, when the original plate holder 10 is provided with the communication hole 16 as in the above-described embodiment, the original film F is removed. There is also an effect that the original film F can be discharged smoothly because the original plate holder 10 does not excessively adhere to the surface of the transparent plate 11 excessively. [Embodiment 2] FIG. 4 is a perspective view of an inclined type plate-making machine as Embodiment 2 of the vacuum contact printing apparatus according to the present invention. The tilt-type platemaker 20 includes a tilted base 21, a left-right moving base 22 movably installed on the base 21 in the left-right direction (arrow X direction), and a vertical movement (arrow) in the left-right moving base 22. An up-and-down moving mount 23 supported so as to be movable in the Y direction), and an original plate holder 24 and a light source 25 mounted on the up-and-down moving mount 23 are provided. On the inclined surface of the base 21, there is provided a photosensitive material holding base 26 for holding the photosensitive material P such as a printing plate or film, and adjacent to the photosensitive material holding base 26, it is inclined at substantially the same angle. A supply unit 27 and a discharge unit 28 for supplying and discharging the original film F are provided. A pair of positioning pins 29 are provided upright in the supply unit 27. The positioning pins 29 are fitted into the pin holes formed in the original film F so that a required number of original films F can be prepared in advance. It has become.

Further, the discharge part 28 is provided with a suction cup 30 which adsorbs and receives the original film F from the original plate holder 24 above it and a receiving member 31 which receives the original film F below it. Sensitive material holder 26 and supply unit 2
7 and the discharge part 28 are integrally contacted and separated toward the original plate holder 24. The original film F
In this case, a transparent auxiliary sheet 32 to which an original film 33 is attached is used.

Next, the original plate holder 24 will be described. FIG. 5 is a view showing a cross section of the original plate holder 24,
The thickness of each part is exaggerated. In the figure, the original plate holder 24 includes a transparent plate 34, a frame body 35 that holds the periphery of the transparent plate 34, and a packing member 36 that is provided around the lower surface of the frame body 35. A vacuum suction groove 37 for sucking and holding the original film F is provided along the upper side of the transparent plate 34 at the upper end of the lower surface of the frame body 35.
The vacuum suction groove 37 is connected to the vacuum pump P3. Therefore, when the vacuum pump P3 is operated, the upper end portion of the original film F can be adsorbed and held on the lower end of the original plate holder 24 by the negative pressure. Further, the frame body 35 is provided with an exhaust passage 40 for connecting the space (vacuum chamber R ′) between the original plate holder 24 and the photosensitive material holding base 26 to the vacuum pump P4 to perform vacuum exhaust.

Since the slant type plate-making machine 20 of this embodiment has the slant structure, the original film F can be sucked and held by sucking only the upper end portion. Therefore, there is an advantage that the original plate holder 24 need not be replaced even if the original film size changes. However, when only the upper end portion of the original film F is sucked and held by the original plate holder 24 as in the present embodiment, air may leak, so that as shown in the first embodiment, the auxiliary sheet and the translucent plate are not used. It is not preferable to open the gap to the atmosphere. Therefore, in this embodiment, the flexible light-transmitting member 38 is provided in a hermetically sealed manner around the original film holding side of the frame body 35 of the original plate holder 24, and the flexible light-transmitting member 38 and the light-transmitting plate are provided. The frame body 35 is provided with a communication hole 39 that communicates the gap S ′ with the atmosphere 34 with the atmosphere. This flexible transparent member 38
For example, a transparent resin sheet similar to the auxiliary sheet 32 may be used, and preferably it is replaceably fixed with an adhesive tape or the like.

Next, the operation of the tilt type platemaking machine 20 will be described. When performing vacuum contact printing using the inclined type plate-making machine 20 and the original plate holder 24, first, a predetermined original plate film F is loaded on the supply unit 27, and the photosensitive material P is placed on the photosensitive material holder 26.
Is placed. Next, the original plate holder 24 is attached to the supply unit 27.
Move up. Subsequently, the supply unit 27 and the photosensitive material holding base 26 are integrally brought close to the original plate holder 24,
The original plate holder 24 is brought into contact with the original film F on the supply unit 27. When the original plate holder 24 comes into contact with the original plate film F, the vacuum pump P3 is operated and the upper end of the original plate film F is sucked and held by the original plate holder 24 by the vacuum suction groove 37. When the suction holding is completed, the supply unit 27 is moved back to the original position, and the original plate holder 24 is positioned and moved. At this time, since the original plate holder 24 holds only the upper end portion of the original film F, the original film F hangs down by its own weight, but since the inclined type engraving machine 20 has an inclined structure, the above holding method is a problem. Never be.

After the positioning, the photosensitive material holder 26 is raised to bring the original plate holder 24 into pressure contact with the photosensitive material P on the photosensitive material holder 26. Subsequently, the vacuum chamber R ′ is evacuated by the vacuum pump P4 to bring the original film F and the photosensitive material P into vacuum contact with each other. When the atmospheric pressure in the vacuum chamber R'is reduced by exhaustion, air flows into the gap S'through the communication hole 39 and the flexible transparent member 38 is pushed out toward the photosensitive material P side as shown in FIG.
Therefore, the original film F is pressed against the photosensitive material P by applying a pressing force by the atmosphere in addition to the negative pressure by the exhaust, and more reliable vacuum contact can be achieved. Then, when the vacuum contact is completed, the light source 25 is exposed. next,
After the exposure is completed, the vacuum chamber R ′ is opened to the atmosphere and the vacuum contact is released. When the positioning and vacuum contact printing steps are performed a predetermined number of times, the original plate holder 24 moves to the discharging portion 28 and the original film F is discharged. [Embodiment 3] FIG. 6 is a perspective view of a belt conveyance type multi-sided printing machine as a third embodiment of the vacuum contact printing apparatus of the present invention.
The printing machine 41 includes a main body 42, a mounting table 43 that is vertically movable on the upper surface of the main body 42, and a translucent frame 45 that can be opened and closed by an air cylinder 44 with respect to the mounting table 43. Belt means 47 that is movable in the front-back direction (arrow Y direction) and left-right direction (arrow X direction) with respect to the mounting table 43 with one end of the original film 46 attached.
And a light source 48.

FIG. 7 is a view showing a cross section of the light-transmitting frame 45, in which the thickness of each portion is exaggerated. In the figure, a translucent frame 45 includes a translucent plate 49, a frame body 50 that holds the perimeter of the translucent plate 49, a packing member 51 provided around the lower surface of the frame body 50, and the perimeter of the translucent plate 49. And a flexible light-transmissive member 52 that is fixed in a hermetically sealed manner. In addition, the frame body 50 is provided with a communication hole 53 that communicates a gap S ″ between the flexible light transmissive member 52 and the light transmissive plate 49 to the atmosphere. The exhaust passage 54 is connected to the light transmissive frame 45. The mounting table 43 is provided in order to exhaust the space (exposure chamber R ″) between the mounting table 43 and the mounting table 43 with the vacuum pump P5.

Next, the operation of the belt transfer type multi-sided printing machine 41 will be described. First, an operator attaches one end of an original film to the belt means 47 and places the photosensitive material P on the photosensitive base 43. Next, when the start of the work is instructed, the mounting table 43 is lowered and the belt means 47 is moved to the mounting table 4.
Raise to the top of 3. While the mounting table 43 is descending, air is blown from the gap between the main body 42 and the mounting table 43 to the original film 46 by an air blowing means (not shown), and the original film 46 is also floated on the mounting table 43. . In this state, the belt means 47 is moved in the XY directions by a moving mechanism (not shown), and the mounting table 43 is raised at a predetermined position to complete the positioning of the original film 46.

Subsequently, the translucent frame 45 is attached to the air cylinder 4
4, the vacuum chamber P ″ is evacuated by operating the vacuum pump P5. When the vacuum chamber R ″ is decompressed by the exhaust, air flows into the gap S ″ from the communication hole 53 and the flexible light transmission is performed. The member 52 swells toward the mounting table 43. Therefore, in addition to the normal contact pressure by vacuum contact, the flexible transparent member 5
The pressing force by 2 is also applied, so that the original film 46 and the photosensitive material P are more firmly brought into close contact with each other. When the vacuum contact is completed in this way, the light source 48 exposes the film. When the exposure is completed, the vacuum contact is released, and the above-described positioning and vacuum contact baking steps are repeated a predetermined number of times. [Other Embodiments] (a) In the above-mentioned Embodiments 1 to 3, the communication holes are communicated with the atmosphere, but by connecting to another high-pressure source such as a compressor, air having a pressure higher than atmospheric pressure is used. A stronger pressing force may be obtained. (B) In Example 2 above, the upper end of the original film is suction-held, but the entire circumference may be suction-held, or instead of suction-held, it may be stuck and held by an adhesive tape or the like. (C) In the third embodiment, as the vacuum contact printing apparatus, the belt-conveying type multi-sided printing machine is taken as an example, but the present invention can be applied to a printing frame or a printer.

[0028]

In the vacuum contact printing apparatus according to the first aspect of the present invention, since the original plate holder is provided with the communication hole for communicating the gap between the original film held by the original plate holder and the holding member with the atmosphere or with the high pressure source, When the original film and the photosensitive material are brought into vacuum contact with each other, air flows into the gap between the original film and the holding member through the communication hole due to the difference in atmospheric pressure. This allows
Since the original film is extruded to the side of the photosensitive material, the adhesion between the original film and the photosensitive material can be improved as compared with normal vacuum adhesion with a simple structure in which a communication hole is provided without complicated labor.

In the vacuum contact printing apparatus according to the second invention,
Since the original plate holder is provided with a communication hole for communicating the gap between the flexible transparent member fixed around the holding member of the holding member of the original plate holder on the original film holding side and the holding member with the atmosphere or the high pressure source, When the material and the material are brought into vacuum contact with each other, air flows into the gap between the flexible transparent member and the holding member through the communication hole due to the difference in atmospheric pressure. As a result, the flexible transparent member is extruded to the photosensitive material side, and the original film is further extruded to the photosensitive material side, so that the original film is simply formed with a communication hole without complicated labor. The adhesion with the photosensitive material can be improved as compared with normal vacuum adhesion.

In the vacuum contact printing apparatus according to the third invention,
A flexible light-transmitting member having a fixed periphery is provided on the mounting table side of the light-transmitting plate, and a communication hole is provided for communicating the gap between the flexible light-transmitting member and the light-transmitting plate to the atmosphere or a high-voltage source. Therefore, when the original film and the photosensitive material are brought into vacuum contact with each other, air flows into the gap between the flexible light-transmitting member and the light-transmitting plate through the communication hole due to the difference in atmospheric pressure. As a result, the flexible translucent member is pushed out to the side of the photosensitive material holding base, and the original film is pushed out to the side of the photosensitive material, so that the original document has a simple structure in which a communication hole is provided without any troublesome work. The adhesion between the film and the photosensitive material can be improved as compared with normal vacuum adhesion.

[Brief description of drawings]

FIG. 1 is a perspective view showing a flat plate engraving machine as a first embodiment of a vacuum contact printing apparatus according to the present invention.

FIG. 2 is a cross-sectional view of a master plate holder of a flat type plate making machine.

FIG. 3 is a sectional view taken along line III-III of FIG.

FIG. 4 is a perspective view showing an inclined type engraving machine as a second embodiment of the vacuum contact printing apparatus according to the present invention.

FIG. 5 is a cross-sectional view of a master plate holder of the tilt type platemaker.

FIG. 6 is a perspective view showing a belt-conveying type multi-side printing machine as a vacuum contact printing apparatus according to a third embodiment of the present invention.

FIG. 7 is a cross-sectional view of an original plate holder of a belt transport type multi-sided printing machine.

[Explanation of symbols]

 1 Flat Plate Reproduction Machine 2 Sensitive Material Holding Base 7 Light Source 10 Original Plate Holder 11 Transparent Plate 14 Vacuum Suction Groove 15 Auxiliary Sheet 16 Communication Hole 17 Exhaust Passage 19 Original Film P Photosensitive Material F Original Plate Film P1, P2 Vacuum Pump S Gap R Vacuum chamber 20 Inclined type plate machine 24 Original plate holder 25 Light source 26 Sensitive material holder 32 Auxiliary sheet 33 Original film 34 Translucent plate 37 Vacuum suction groove 38 Flexible translucent member 39 Communication hole P3, P4 Vacuum pump S'Gap R'vacuum chamber 41 belt transfer type multi-sided printing machine 43 mounting table 45 translucent frame 46 original film 48 light source 49 translucent plate 52 flexible translucent member 53 communication hole P5 vacuum pump S "gap R" vacuum chamber

Claims (3)

[Claims] 1. A vacuum contact printing apparatus for vacuum-bonding an original film on a photosensitive material to print an image formed on the original film on the photosensitive material, the photosensitive material holding base holding the photosensitive material; A transparent holding member that holds the original film, and a communication hole that communicates a gap between the original film and the holding member to an atmosphere or a high-pressure source, in a state where the original film is held, An original plate holder for positioning the original plate film with respect to the photosensitive material held on the photosensitive material holding base, and exhausting the space between the photosensitive material holding base and the original plate holder, and the photosensitive material and the original film. A vacuum contact printing device for exposing the light-sensitive material and the original film film that have been vacuum-contacted to each other through the holding member. 2. A vacuum contact printing apparatus for vacuum-bonding an original film on a photosensitive material to print an image formed on the original film on the photosensitive material, comprising: a photosensitive material holding base for holding the photosensitive material; A transparent holding member that holds at least a part of the original film, a flexible transparent member whose periphery is fixed to the original film holding side of the holding member, the flexible transparent member and the holding member. With a communication hole that communicates the gap between and with the atmosphere or a high-pressure source, with a part of the original film being held,
An original plate holder for positioning the original film with respect to the photosensitive material held on the photosensitive material holding base, and a space between the photosensitive material holding base and the original plate holder is evacuated to form the photosensitive material and the original film. A vacuum contact printing apparatus comprising: a vacuum contact means for vacuum-contacting with each other; and an exposure means for exposing the photosensitive material and the original film film, which are vacuum-contacted with each other, through the holding member. 3. A vacuum contact printing apparatus for vacuum-contacting an original film on a photosensitive material to print an image formed on the original film on the photosensitive material, wherein the photosensitive material and the original film are placed on top of each other. A mounting table, a translucent plate, a flexible translucent member whose periphery is fixed to the mounting table side of the translucent plate, and a gap between the flexible translucent member and the translucent plate to the atmosphere. Alternatively, a light-transmitting frame provided with a communication hole communicating with a high-voltage source, the light-transmitting frame being openable and closable with respect to the mounting table, and the space between the mounting table and the light-transmitting frame being exhausted, the photosensitive material And a vacuum contact means for vacuum-contacting the original film with each other, and an exposure means for exposing the photosensitive material and the original film, which are vacuum-contacted with each other, through the transparent plate to expose the original film.